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FEA TURES
SPECIFICATIONS
CHARACTERISTICS
FEA TURES
FM HIGHLY SENSITIVE TWO-STAGE RF
AMPLIFIER USING TWO NUVISTORS AND
THREE-GANG VARIABLE CONDENSER
This top-quality, super-sensitive tuner fully in-
corporates the best of Sansui's techniques as
demonstrated by the RF amplifier consisting of
two Nuvistors. Read these instructions carefully
before you use the tuner for the first time. The
TU-70 tuner has an extremely compact, high-gain
RF amplifier for FM which uses two cascade-
coupled, low-noise Nuvistor tubes with a three-
gang variable condenser. Therefore, the tuner
outperforms conventional single-stage grounded-
grid RF amplifiers by 10 db in amplification
and assures stable, high-selectivity, high fidelity
reception.
The TU -70 tuner has sensitivity characteristics
of 1.2 microvolts at 20-dB quieting 100% mod-
ulation and 1.8 microvolts at 30-clB quieting 100%
modulation. Unwanted radio waves are so neg-
ligible that they do not interfere with TV and
other receivers.
DOUBLE-LIMITER SHUTS OUT NOISES
The TU-70 tuner' is equipped with a two-stage
noise limiter, which works effectively even where
the field intensity is weak. It reliably eliminates
a wide variety of noises such as annoying ignition
sounds and other interference.
MUTING SWITCH SUPPRESSES NOISE
DURING CHANNEL SELECTION
Unlike conventional FM receivers, which produce
loud noise in the absence of input because their
limiters require a certain level of input voltage
to perform their noise-limiting function, the. TU-
70 tuner produces no noise even when not tuned
to any station. This is because it has a built-in
-3-
"muting switch" (squelch circuit) which discon-
nects the audio amplifier stage automatically when
tuner input drops below a certain leveL.
AMAZING CHANNEL SEPARATION OF 37DB
AND MORE ENSURED BY ADVANCED FM
MULTIPLEX CIRCUIT
The adoption of the most advanced switching
matrix method for the multiplex circuit has
amazingly improved the performance of the TU -70
tuner. Channel separation is minimum 37 dB at
1 kc and distortion is maximum 1% at 1 kc.
FULL-FLEDGED AUTOMATIC FREQUENCY
CONTROL (AFC)
The TU-70 has a full-fledged AFC, which can
be switched off if you like. The AFC enables
you to enjoy a stabilized reception of FM broad-
casts for many hours once you have tuned to.
EASY-TO-SEE FM MULTIPLEX STEREO
INDICATOR
The FM Multiplex Stereo Indicator actuated by
precision transistors helps you tune to FM stereo
stations easily and reliably.
AM SINGLE-STAGE RF AMPLIFIER WITH
THREE-GANG VARIABLE CONDENSER
The addition of a single-stage RF amplifier to
the AM tuner has improved its sensivity remark-
ably. This makes it particularly useful for DX
reception. Moreover, it has such an excellent
image ratio that no beat is produced between
your station and another neighboring station.
BUILT-IN, HIGH-SENSITIVITY FERRITE
ANTENNA
The built-in, high-sensivity ferrite antenna adds
to your listening pleasure by reducing noise to
less than that of conventional tuners.
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